As with most conflicts, the truth usually lies somewhere in the middle. That said, I am left with a poor impression of the NHRA based on the information that has been presented to date. My personal feeling is that the severity of the punishment levied far exceeds the severity of the infraction.
I no longer have access to a current NHRA rule book, but if someone who does could look I have a question. Does the rule cited state that all expired inspection stickers must be removed? If so, does it state who is responsible for their removal? IMHO an interpretation could be made that the sticker was no longer valid as it's expiration had passed and along with it the sanctioning body's ownership of same.
As an aside, I have personally seen numerous expired chassis inspection stickers on cars, usually in the for sale category. Everyone had better start checking their stuff before they get near an NHRA official lest they pull a suspension....